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502 Rebuild with side whipple

Old 01-22-2021, 12:06 PM
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Default 502 Rebuild with side whipple

I am doing a rebuild on my 502 with a Side whipple. I recently burned a whole in the #6 piston so i want to get this thing right. The block is currently at the machine shop.

4.500 bore x 4.250 stroke.
je forged pistons
rod length is 6.385
gil exhaust
088 heads
5lbs of boost.

fuel system has been upgraded with an Aeromotive A1000, fuel pressure regulator with the return back to the tanks.



my questions

1) Can i continue to use the stock injectors since the whipple has 2 on the throttle body? If not any recommendations on what injectors to use?

2) i currently have a Mefi-3 system, will a upgrade be necessary for bigger injectors (Mefi4 or other systems)?

3) any recommendations on what Cam to go with?


if any additional information is needed i will be more than happy to provide it.

Last edited by flawlesson24z; 01-22-2021 at 12:43 PM.
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Old 01-22-2021, 12:21 PM
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Are you building a 540 ? whats the rod length
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Old 01-22-2021, 12:23 PM
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Originally Posted by F-2 Speedy View Post
Are you building a 540 ? whats the rod length
yes, rod length is 6.385
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Old 01-22-2021, 12:27 PM
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then the answer to #1 is no..........#2 mefi 3 is fine, the 4b has more tuning capabilities, #3 Id look for a Merc 525 cam, its a proven choice
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Old 01-22-2021, 12:34 PM
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Originally Posted by F-2 Speedy View Post
then the answer to #1 is no..........#2 mefi 3 is fine, the 4b has more tuning capabilities, #3 Id look for a Merc 525 cam, its a proven choice
thanks!

any recommendations on what injectors?
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Old 01-22-2021, 12:35 PM
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let me back up, what heads and exhaust are you planning to run
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Old 01-22-2021, 12:38 PM
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Originally Posted by F-2 Speedy View Post
let me back up, what heads and exhaust are you planning to run
088 heads were just rebuilt with bigger stainless valves and springs (dont know exact specs)

gil exhaust
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Old 01-22-2021, 12:53 PM
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So this system uses 10 injectors 2 in the TB and 8 in the intake ? what size are the current ones. you probably had a lean condition than did #6 in, was it ever tuned with O2 sensors.
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Old 01-22-2021, 12:58 PM
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Originally Posted by F-2 Speedy View Post
So this system uses 10 injectors 2 in the TB and 8 in the intake ? what size are the current ones. you probably had a lean condition than did #6 in, was it ever tuned with O2 sensors.
yes, so 10 injectors total.
the 8 in the intake are stock (42lb i believe)
the supercharger are stock as well.(dont know the specs)

yes, the boat was tuned with ab O2 sensor but the last builder used dome pistons and i was not aware of that. So i believe high compression also played a role.
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Old 01-22-2021, 01:07 PM
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You might want to call Whipple on the injector sizing, Articfriends ( Smitty ) on here might have an idea also, you can send him a pm if he doesn't see this thread
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